Concept:An automatic system works on its own with minimal human control.
Explanation:An automatic system is designed to operate independently after it is set up or programmed.
It usually uses sensors, timers, or built-in logic to perform its tasks.
It can adjust its actions based on feedback from its environment.
Therefore, such a system requires little or no direct human intervention to work.
Manual systems, by contrast, need constant human effort, while automatic systems reduce this need.
Option D best describes this meaning.
Answer:D. requires little or no human intervention to work.